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https://issues.apache.org/jira/browse/HDFS-13452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438687#comment-16438687
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lujie commented on HDFS-13452:
------------------------------
sorry about that put wrong place, should be hbase
> Two Potential NPE
> ------------------
>
> Key: HDFS-13452
> URL: https://issues.apache.org/jira/browse/HDFS-13452
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: lujie
> Priority: Major
>
> Callee ZKUtil#listChildrenAndWatchForNewChildren may return null, it has 8
> callers, 6 of the caller have null checker like:
> {code:java}
> List<String> children = ZKUtil.listChildrenAndWatchForNewChildren(zkw,
> zkw.znodePaths.rsZNode);
> if (children == null) {
> return Collections.emptyList();
> }
> {code}
> but another two callers do not have null
> checker:RSGroupInfoManagerImpl#retrieveGroupListFromZookeeper,ZKProcedureMemberRpcs#watchForAbortedProcedures.
>
> We attach the patch to fix this probelm.(We found this bug by tool
> [NPEDetector|https://github.com/lujiefsi/NPEDetector])
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